From Wikipedia, the free encyclopedia [ Ссылка ]

The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected off of metals. This possibility was suggested in James Clerk Maxwell's seminal work on electromagnetism. However, it was not until the early 20th century that systems able to use these principles were becoming widely available, and it was German engineer Christian Huelsmeyer who first used them to build simple ship detection device intended to help avoid collisions in fog (Reichspatent Nr. 165546). Numerous similar systems were developed over the next two decades.

Radar is an object detection system that uses electromagnetic waves to identify the range, altitude, direction, or speed of both moving and fixed objects such as aircraft, ships, motor vehicles, weather formations, and terrain. The term RADAR was coined in 1940 by the U.S. Navy as an acronym for RAdio Detection And Ranging. The term has since entered the English language as a standard word, radar, losing the capitalization. Radar was originally called RDF (Range and Direction Finding) in the United Kingdom, using the same acronym as Radio Direction Finding to preserve the secrecy of its ranging capability.

A radar system has a transmitter that emits radio waves. When they come into contact with an object they are scattered in all directions. The signal is thus partly reflected back and it has a slight change of wavelength (and thus frequency) if the target is moving. The receiver is usually, but not always, in the same location as the transmitter. Although the signal returned is usually very weak, the signal can be amplified through use of electronic techniques in the receiver and in the antenna configuration. This enables radar to detect objects at ranges where other emissions, such as sound or visible light, would be too weak to detect. Radar uses include meteorological detection of precipitation, measuring ocean surface waves, air traffic control, police detection of speeding traffic, military applications, or to simply determine the speed of a baseball.

Click to subscribe! [ Ссылка ] #AIRBOYD #AvGeek

свернуть